rs587777402

Positions:

• chr1-63593600-A-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM2 PP3_Moderate PP5_Very_Strong

The ENST00000371084.8(PGM1):​c.112A>T​(p.Asn38Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PGM1 ENST00000371084.8 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 8.75

Genes affected

PGM1 (HGNC:8905): (phosphoglucomutase 1) The protein encoded by this gene is an isozyme of phosphoglucomutase (PGM) and belongs to the phosphohexose mutase family. There are several PGM isozymes, which are encoded by different genes and catalyze the transfer of phosphate between the 1 and 6 positions of glucose. In most cell types, this PGM isozyme is predominant, representing about 90% of total PGM activity. In red cells, PGM2 is a major isozyme. This gene is highly polymorphic. Mutations in this gene cause glycogen storage disease type 14. Alternativley spliced transcript variants encoding different isoforms have been identified in this gene.[provided by RefSeq, Mar 2010]

ITGB3BP (HGNC:6157): (integrin subunit beta 3 binding protein) This gene encodes a transcriptional coregulator that binds to and enhances the activity of members of the nuclear receptor families, thyroid hormone receptors and retinoid X receptors. This protein also acts as a corepressor of NF-kappaB-dependent signaling. This protein induces apoptosis in breast cancer cells through a caspase 2-mediated signaling pathway. This protein is also a component of the centromere-specific histone H3 variant nucleosome associated complex (CENP-NAC) and may be involved in mitotic progression by recruiting the histone H3 variant CENP-A to the centromere. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Sep 2011]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.93
• PP5: Variant 1-63593600-A-T is Pathogenic according to our data. Variant chr1-63593600-A-T is described in ClinVar as [Pathogenic]. Clinvar id is 133287.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PGM1	NM_002633.3	c.112A>T	p.Asn38Tyr	missense_variant	1/11	ENST00000371084.8	NP_002624.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PGM1	ENST00000371084.8	c.112A>T	p.Asn38Tyr	missense_variant	1/11	1	NM_002633.3	ENSP00000360125	P1
PGM1	ENST00000650546.1	c.112A>T	p.Asn38Tyr	missense_variant	1/12			ENSP00000497812
ITGB3BP	ENST00000478138.1	n.122T>A		non_coding_transcript_exon_variant	1/5	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

PGM1-congenital disorder of glycosylation Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Apr 26, 2022	This sequence change replaces asparagine, which is neutral and polar, with tyrosine, which is neutral and polar, at codon 38 of the PGM1 protein (p.Asn38Tyr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with PGM1-CDG (PMID: 24499211, 26768186, 27206562). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 133287). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. Experimental studies have shown that this missense change affects PGM1 function (PMID: 25288802). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, no assertion criteria provided	literature only	OMIM	Feb 06, 2014	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Mar 11, 2024

Published functional studies found this variant is associated with significantly reduced soluble protein expression (PMID: 25288802); Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 24499211, 32681750, 28837627, 27527004, 27467583, 28617415, 27206562, 30262252, 28940310, 30737079, 25168163, 26768186, 25288802) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Uncertain	0.10
CADD	Pathogenic	29
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.84	D;.
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Uncertain	0.96	D;D
M_CAP	Pathogenic	0.61	D
MetaRNN	Pathogenic	0.93	D;D
MetaSVM	Uncertain	-0.052	T
MutationAssessor	Pathogenic	4.1	H;.
MutationTaster	Benign	1.0	D
PROVEAN	Pathogenic	-6.3	D;.
REVEL	Pathogenic	0.88
Sift	Pathogenic	0.0	D;.
Sift4G	Pathogenic	0.0	D;.
Polyphen		1.0	D;.
Vest4		0.99
MutPred		0.76		Gain of phosphorylation at N38 (P = 0.0587);Gain of phosphorylation at N38 (P = 0.0587);
MVP		0.86
ClinPred		1.0	D
GERP RS		2.6
Varity_R		0.98

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs587777402; hg19: chr1-64059271;